1. Generalized quasilinearization for systems of nonlinear differential equations with periodic boundary conditions;Abd-Ellateef;Dyn. Contin. Discrete Impuls. Syst. Ser. A Math. Anal.,2005
2. On the existence of solutions for PBVP for first-order differential equations;Chen;Acta Math. Sci. Ser. A Chin. Ed.,2003
3. Periodic boundary value problems for the first-order impulsive functional differential equations;Ding;Appl. Math. Comput.,2005
4. Anti-periodic boundary value problem for nonlinear first-order differential equations;Franco;Math. Inequal. Appl.,2003
5. On nonnegative solutions of a periodic type boundary value problem for first-order scalar functional differential equations;Hakl;Funct. Differ. Equ.,2004